Why Shouldn’t I Kill You?

"—ghhhhh!" 

"Achoo!"

Lizbeth shivered and sneezed as she sat on Kenny's table. 

Lith sat opposite to her and was reading a paper written by her. 

On it was an impressive research and analysis of the poisoning Mace and Viona were affected with. 

The wraith-like entities targeted a specific link in a person's body. This link was possessed by every single person in the universe, and was in their entire body. Making it collapse would lead to slow death for them.

Elemental affinities and spiritual power were connected together via a link. This bridge did not have a name, and was usually neglected by most because it didn't really matter much in the grand scheme of things. 

However, these wraith-like entities exploited that very link. As they were beings from a non-materialistic dimension, the link looked like a normal part of a person's body which they can bite off or spread their poison in.